no, really, some iems already have metal boxes... but for an amp is pretty handy. now you are making me want to get one of these things..... a question, do they can drive hard-to-drive headphones, like sennheiser hd650?....

Do you like the metal box? you can use it to carry your E11 with your DAP and earphone.

I already mentioned it in the other thread, but the metal box really makes it for me. It just presents it as the quality product that I don't doubt it is. I hadn't thought of using it for transporting gear, though.